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What is it?

Intermittent Fasting

Intermittent fasting (IF) is an eating pattern that cycles between periods of eating and fasting. It does not dictate what you eat, but when you eat. By narrowing your eating window, your body spends more time in a fasted state — which may support weight management, metabolic health, mental clarity, and cellular repair.

Unlike traditional diets that focus on food restriction, IF is a timing strategy. Many people find it easier to maintain because it reduces the number of decisions they make about food each day.

The Basics

At its core, intermittent fasting simply means alternating between fasting and eating. The most common version is time-restricted eating: you choose a daily window for meals and fast the rest of the day.

During the fasting window, you consume zero or very few calories. Water, black coffee, plain tea, and electrolytes are generally considered acceptable because they do not meaningfully raise insulin.

The goal is not to eat less overall (though that often happens naturally), but to give your body extended breaks from digestion so it can switch fuel sources and activate repair pathways.

What Happens in Your Body
  • 0–4 hours
    Fed state. Your body is digesting the last meal. Blood sugar and insulin are elevated as nutrients are absorbed.
  • 4–12 hours
    Post-absorptive state. Blood sugar begins to fall. The body transitions from using glucose to using stored glycogen for energy.
  • 12–16 hours
    Glycogen use. Glycogen stores are depleted and fat burning ramps up. Growth hormone levels begin to rise.
  • 16+ hours
    Deep fasting. Ketosis increases, autophagy may begin, and insulin sensitivity can improve. Hunger often softens.
Common Schedules

Choose a schedule that fits your lifestyle. Beginners usually do best with shorter fasting windows and gradually progress.

  • 12:12Fast 12 hours, eat within 12 hours. The gentlest entry point — basically skipping late-night snacking.
  • 14:10Fast 14 hours, eat within 10 hours. A comfortable step up from 12:12 with a longer overnight fast.
  • 16:8Fast 16 hours, eat within an 8-hour window. The most popular starting point — often skipping breakfast.
  • 18:6Fast 18 hours, eat within 6 hours. A step up from 16:8 for those who want a deeper fasted state.
  • 20:4Fast 20 hours with a 4-hour eating window. Also called the Warrior Diet — best for experienced fasters.
  • OMADOne meal a day — roughly a 23-hour fast with a single eating window. Advanced and not for everyone.
  • 5:2Eat normally 5 days a week, restrict calories to roughly 500–600 on 2 non-consecutive days.
  • Alternate DayFast every other day, either completely or with a very low calorie intake (~500) on fasting days.
Potential Benefits
  • May support weight management by reducing overall calorie intake
  • May improve insulin sensitivity and blood sugar control
  • Can promote mental clarity and steady energy once adapted
  • May trigger cellular repair processes like autophagy
  • Simplifies meal planning and reduces decision fatigue
  • Can help break snacking habits and rebuild hunger awareness
Beginner Tips
  • Start slow. Begin with 12:12 or 14:10 for a week or two. Let your body adapt before moving to 16:8 or longer.
  • Hydrate often. Water, black coffee, and plain tea are your friends during fasting hours. They curb hunger and headaches.
  • Eat enough during your window. Fasting is not starvation. Prioritize protein, fiber, healthy fats, and whole foods when you eat.
  • Plan your eating window. Choose times that fit your social life and sleep schedule. Consistency makes adherence much easier.
  • Break fasts gently. Start with something light — soup, eggs, yogurt, or fruit — before a heavier meal to avoid digestive upset.
  • Listen to your body. Dizziness, nausea, or extreme fatigue are signals to eat. Fasting should feel challenging, not dangerous.
Common Mistakes
  • Binge eating during the eating window — quality still matters.
  • Not drinking enough water, which worsens headaches and hunger.
  • Choosing ultra-processed foods just because they fit the time window.
  • Ignoring sleep, stress, and recovery, which all affect hunger hormones.
  • Jumping straight into OMAD or 20:4 without building up gradually.
Who Should Avoid It
  • Pregnant or breastfeeding individuals
  • Children and teenagers
  • People with a history of eating disorders
  • Those with type 1 diabetes or on blood sugar medications
  • Anyone underweight or with a medical condition affected by fasting
Daily Habits
  • Morning: Drink water first thing. Black coffee or plain tea is fine during the fast.
  • Mid-fast: Stay busy. Light activity like walking can reduce hunger and improve mood.
  • Evening: Avoid heavy meals right before bed. A consistent sleep schedule helps regulate hunger hormones.
  • Meals: Build plates around protein, vegetables, whole grains, and healthy fats for lasting fullness.

This information is for educational purposes only and is not medical advice. Consult a qualified healthcare professional before making significant changes to your diet, especially if you are pregnant, nursing, taking medication, or have a medical condition.